This slave gets restrained by two mistresses and will be left without escape to eat shit of both of them. While the first lady prepares for shitting by lying on her back and raising their legs high, the other one forces the slave to get his mouth close to her brown asshole until he gets his injection. He has no fun though and is close to his borders, but the lady holds his head tight in her arms and pushes him right to the shitting hole every time he tries to escape. He opens his mouth and eats their scat unwillingly.
Mistress Gaia loves torturing the most, when her slave has fed enough shit and gets tired of it. And Lady Gaia feeds her daily, so it's kinda understandable; but it simply doesn't count to the mistress, 'cause she has the only power of decision. And she uses it, so her slave won't forget that mistress Gaia is the master. Her slave has to lie down as always and suck all her scat, even if she's fed up! She has some problems to swallow it fast, but she will. Completely.